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Stels [109]
3 years ago
14

Simplify: (3x + y)^3 + (3x - y)^3​

Mathematics
2 answers:
tatyana61 [14]3 years ago
8 0

Answer:

54x^3+18xy^2

Step-by-step explanation:

1.) Expand the Expressions

(3x + y)^3 + (3x - y)^3​  =====> 27x^3 + 27x^2y + 9xy^2 + y^3 + 27x^3 - 27x^2y + 9xy^2 - y^3

2.) Remove/Cancel out Opposites

27x^3 + 9xy^2 + 27x^3 + 9xy^2

3.) Collect like terms

27x^3 + 9xy^2 + 27x^3 + 9xy^2

54x^3 + 9xy^2 + 9xy^2

54x^3 + 18xy^2

Formulas used :

(a+b)^3 = a^3  + 3a^2b + 3ab^2 +b^3 (step 1)

Thank You!!! Plzz mark brainliest

ozzi3 years ago
8 0

Answer:

54x^3 +18xy^2

Step-by-step explanation:

See the steps below:)

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